Comment # 9 on bug 1191362 from Felix Niederwanger

Both packages, xdg-desktop-portal and xdg-desktop-portal-gtk were installed
previously:

> 2021-06-18 15:09:25|install|xdg-desktop-portal|1.8.1-1.2|x86_64||openSUSE-20210615-0|11fc93d78ba059f264c1b347bb0a2cc4f5a748aa994ac00eeaa3e55ca332ecf2|

However, I see that xdg-desktop-portal-gnome was installed later, on the 19.10:

> 2021-10-19 08:28:15|install|xdg-desktop-portal|1.10.1-1.1|x86_64||download.opensuse.org-oss|b9b372f2bf5b81ea714c39e54f2e99b56697310ab8977de2e6327001fbf344f3|
> 2021-10-19 08:28:16|install|xdg-desktop-portal-gnome|41.1-2.1|x86_64||download.opensuse.org-oss|407348c8e7ccae485475bc2bac7d3f689f88ad6a878c9df1e108c05700ba04be|

I guess that could have been the reason?

Closing the ticket now, as the issue is resolved and it seems to work again.
Thank you Martin for looking into this!